Hi Prabhu,
Method 1:
I would suggest you to install the AMD Graphics Drivers from the Manufacturer’s website and check.
Refer to the link to download the drivers;
http://support.amd.com/us/gpudownload/Pages/index.aspx
Note: Select the supported operating system to download the correct drivers.
Method 2:
If still you face any issues I would suggest you to uninstall and reinstall the Graphics drivers from Device Manager and check if it helps;
a) Press Windows Key + R, type devmgmt.msc.
b) Expand the graphic card, click on the drivers.
c) Click on properties, click on uninstall tab.
d) Click OK.
Reboot the computer to update the drivers automatically.
In case not able to update the drive I would suggest you to manually download and install the drivers from the Manufacturer’s website and check.
If you need further assistance regarding Windows, please feel free to post. We will be happy to help you.